{"id":20007,"date":"2020-08-17T01:12:03","date_gmt":"2020-08-17T01:12:03","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=20007"},"modified":"2020-08-17T01:12:04","modified_gmt":"2020-08-17T01:12:04","slug":"quality-issue-or-technical-issue-when-your-screw-taps-frequently-crack","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/pl\/quality-issue-or-technical-issue-when-your-screw-taps-frequently-crack\/","title":{"rendered":"Problem z jako\u015bci\u0105 lub problem techniczny, gdy tw\u00f3j wkr\u0119t cz\u0119sto p\u0119ka"},"content":{"rendered":"
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Poor quality tap<\/strong><\/h2>\n\n\n\n

G\u0142\u00f3wne materia\u0142y, konstrukcja narz\u0119dzi CNC, obr\u00f3bka cieplna, dok\u0142adno\u015b\u0107 obr\u00f3bki, jako\u015b\u0107 pow\u0142oki i tak dalej. Na przyk\u0142ad, r\u00f3\u017cnica wielko\u015bci przej\u015bcia sekcji gwintownika jest zbyt du\u017ca lub zaokr\u0105glenie przej\u015bcia nie jest zaprojektowane, co prowadzi do koncentracji napr\u0119\u017ce\u0144, kt\u00f3re \u0142atwo p\u0119kaj\u0105 przy koncentracji napr\u0119\u017ce\u0144. Odleg\u0142o\u015b\u0107 mi\u0119dzy przej\u015bciow\u0105 cz\u0119\u015bci\u0105 przekroju na styku r\u0119koje\u015bci i kraw\u0119dzi jest zbyt blisko spoiny, co skutkuje superpozycj\u0105 z\u0142o\u017conego napr\u0119\u017cenia spawalniczego i koncentracj\u0105 napr\u0119\u017ce\u0144 w przej\u015bciu przekroju, co powoduje w du\u017cej koncentracji napr\u0119\u017ce\u0144, co prowadzi do p\u0119kni\u0119cia kranu podczas u\u017cytkowania. Na przyk\u0142ad niew\u0142a\u015bciwy proces obr\u00f3bki cieplnej. Podczas obr\u00f3bki cieplnej kran\u00f3w mog\u0105 wyst\u0105pi\u0107 p\u0119kni\u0119cia, je\u015bli krany nie zosta\u0142y wst\u0119pnie podgrzane przed hartowaniem, przegrzane lub przegrzane po hartowaniu, nie odpuszczone na czas i oczyszczone zbyt wcze\u015bnie. W du\u017cej mierze jest to r\u00f3wnie\u017c wa\u017cny pow\u00f3d, dla kt\u00f3rego og\u00f3lna wydajno\u015b\u0107 kran\u00f3w krajowych jest gorsza od wydajno\u015bci kran\u00f3w importowanych.<\/strong><\/strong><\/p>\n\n\n\n

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Improper tap selection<\/strong><\/h2>\n\n\n\n

High quality taps, such as cobalt containing high speed wire taps, cemented carbide taps and coated taps, should be selected for the parts with too high hardness. In addition, different tap designs are used in different work situations. For example, the number, size and angle of the chip removal slot of the tap have an impact on the chip removal performance.<\/strong><\/strong><\/p>\n\n\n\n

The tap does not match the processed material<\/strong><\/h2>\n\n\n\n

In recent years, more and more attention has been paid to this problem. In the past, domestic manufacturers always thought that imported goods were good and expensive ones were suitable. With the increasing of new materials and the difficulty of machining, in order to meet this need, the variety of tool materials is also increasing. This requires that before tapping, select the right tap products.<\/strong><\/strong><\/p>\n\n\n\n

The bottom hole diameter is too small<\/strong><\/h2>\n\n\n\n

For example, when machining the M5 \u00d7 0.5 thread of ferrous metal material, the drill bit with 4.5mm diameter should be used to drill the bottom hole. If the 4.2mm drill bit is used to drill the bottom hole, the cutting part of the tap must be increased during tapping, and the tap will be broken. It is suggested to select the correct bottom hole diameter according to the types of taps and the different materials of the taps. If there is no suitable drill bit, the larger one can be selected.<\/strong><\/strong><\/p>\n\n\n\n

Material problem of tapping parts<\/strong><\/h2>\n\n\n\n

The material of the tapping part is not pure, and there are some hard spots or pores in some parts, which causes the tap to lose balance and break instantly.<\/strong><\/strong><\/p>\n\n\n\n

The machine does not meet the accuracy requirements of taps<\/strong><\/h2>\n\n\n\n

Machine tool and clamping body are also very important, especially for high-quality taps, as long as a certain precision of the machine tool and clamping body can play the tap performance. It is common that the concentricity is not enough. At the beginning of tapping, the starting and positioning of the tap is not correct, that is, the spindle axis is not concentric with the center line of the bottom hole, and the torque is too large in the tapping process, which is the main reason for the tap breaking.<\/strong><\/strong><\/p>\n\n\n\n

The quality of cutting fluid and lubricating oil is poor<\/strong><\/h2>\n\n\n\n

Many domestic enterprises have begun to pay attention to this point. Many companies that have purchased foreign cutting tools and machine tools have a very profound experience. The quality of cutting fluid and lubricating oil has problems. The quality of processed products is easy to appear burr and other adverse conditions, and the service life will be greatly reduced.<\/strong><\/strong><\/p>\n\n\n\n

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Unreasonable cutting speed and feed rate<\/strong><\/h2>\n\n\n\n

When machining problems occur, most of the domestic users reduce the cutting speed and feed rate, so that the driving force of the tap is reduced, and the thread accuracy is greatly reduced, which increases the surface roughness of the thread, and the thread diameter and thread accuracy can not be controlled. Of course, burr and other problems are inevitable. However, if the feeding speed is too fast, the torque caused by it is too large, and it is easy to break the tap. The cutting speed of machine tapping is generally 6-15m \/ min for steel, 5-10m \/ min for Quenched and tempered steel or hard steel, 2-7m \/ min for stainless steel and 8-10m \/ min for cast iron. In the same material, the smaller the tap diameter is, the higher the tap diameter is, the lower the larger tap diameter is.<\/strong><\/strong><\/p>\n\n\n\n

9. The operator’s technology and skills did not meet the requirements<\/strong><\/strong><\/p>\n\n\n\n

The above problems need operators to make judgment or feedback to technical personnel, but at present, most operators in China do not pay enough attention to them. For example, when processing blind hole thread, when the tap is about to contact the bottom of the hole, the operator does not realize that the tap is still feeding at the tapping speed when the hole bottom is not reached, or the tap is broken due to forced feeding when chip removal is not smooth. It is suggested that operators should strengthen their sense of responsibility.<\/strong><\/strong><\/p>\n\n\n\n

It can be seen from the above that the causes of tap fracture can be said to be various. Machine tools, fixtures, workpieces, processes, chucks and cutting tools are all possible, and the real reason may never be found only by talking on paper. As a qualified and responsible tool application engineer, the most important thing is to go deep into the scene, not just by imagination.<\/strong><\/strong><\/p>\n\n\n\n

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<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Poor quality tap Main materials, CNC tool design, heat treatment, machining accuracy, coating quality and so on. For example, the size difference of tap section transition is too big or the transition fillet is not designed, which leads to stress concentration, which is easy to fracture at the stress concentration. The distance between the transition…<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[92],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/posts\/20007"}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/comments?post=20007"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/posts\/20007\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/media?parent=20007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/categories?post=20007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/pl\/wp-json\/wp\/v2\/tags?post=20007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}